GFS2: Clean up fsync()

This patch is designed to clean up GFS2's fsync
implementation and ensure that it really does get everything on
disk. Since ->write_inode() has been updated, we can call that
via the vfs library function sync_inode_metadata() and the only
remaining thing that has to be done is to ensure that we get
any revoke records in the log after the inode has been written back.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

3 files changed, 57 insertions, 40 deletions

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index e48310885c48..23eab473f09d 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -545,18 +545,10 @@ static int gfs2_close(struct inode *inode, struct file *file)
 /**
  * gfs2_fsync - sync the dirty data for a file (across the cluster)
  * @file: the file that points to the dentry (we ignore this)
- * @dentry: the dentry that points to the inode to sync
+ * @datasync: set if we can ignore timestamp changes
  *
- * The VFS will flush "normal" data for us. We only need to worry
- * about metadata here. For journaled data, we just do a log flush
- * as we can't avoid it. Otherwise we can just bale out if datasync
- * is set. For stuffed inodes we must flush the log in order to
- * ensure that all data is on disk.
- *
- * The call to write_inode_now() is there to write back metadata and
- * the inode itself. It does also try and write the data, but thats
- * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
- * for us.
+ * The VFS will flush data for us. We only need to worry
+ * about metadata here.
  *
  * Returns: errno
  */
@@ -565,22 +557,20 @@ static int gfs2_fsync(struct file *file, int datasync)
 {
         struct inode *inode = file->f_mapping->host;
         int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
-        int ret = 0;
-
-        if (gfs2_is_jdata(GFS2_I(inode))) {
-                gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
-                return 0;
-        }
+        struct gfs2_inode *ip = GFS2_I(inode);
+        int ret;
 
-        if (sync_state != 0) {
-                if (!datasync)
-                        ret = write_inode_now(inode, 0);
+        if (datasync)
+                sync_state &= ~I_DIRTY_SYNC;
 
-                if (gfs2_is_stuffed(GFS2_I(inode)))
-                        gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
+        if (sync_state) {
+                ret = sync_inode_metadata(inode, 1);
+                if (ret)
+                        return ret;
+                gfs2_ail_flush(ip->i_gl);
         }
 
-        return ret;
+        return 0;
 }
 
 /**
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 25eeb2bcee47..7c1b08f63ddb 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -28,33 +28,18 @@
 #include "trans.h"
 
 /**
- * ail_empty_gl - remove all buffers for a given lock from the AIL
+ * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
  * @gl: the glock
  *
  * None of the buffers should be dirty, locked, or pinned.
  */
 
-static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
+static void __gfs2_ail_flush(struct gfs2_glock *gl)
 {
         struct gfs2_sbd *sdp = gl->gl_sbd;
         struct list_head *head = &gl->gl_ail_list;
         struct gfs2_bufdata *bd;
         struct buffer_head *bh;
-        struct gfs2_trans tr;
-
-        memset(&tr, 0, sizeof(tr));
-        tr.tr_revokes = atomic_read(&gl->gl_ail_count);
-
-        if (!tr.tr_revokes)
-                return;
-
-        /* A shortened, inline version of gfs2_trans_begin() */
-        tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
-        tr.tr_ip = (unsigned long)__builtin_return_address(0);
-        INIT_LIST_HEAD(&tr.tr_list_buf);
-        gfs2_log_reserve(sdp, tr.tr_reserved);
-        BUG_ON(current->journal_info);
-        current->journal_info = &tr;
 
         spin_lock(&sdp->sd_ail_lock);
         while (!list_empty(head)) {
@@ -76,7 +61,47 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
         }
         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
         spin_unlock(&sdp->sd_ail_lock);
+}
+
+
+static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
+{
+        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_trans tr;
+
+        memset(&tr, 0, sizeof(tr));
+        tr.tr_revokes = atomic_read(&gl->gl_ail_count);
+
+        if (!tr.tr_revokes)
+                return;
+
+        /* A shortened, inline version of gfs2_trans_begin() */
+        tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
+        tr.tr_ip = (unsigned long)__builtin_return_address(0);
+        INIT_LIST_HEAD(&tr.tr_list_buf);
+        gfs2_log_reserve(sdp, tr.tr_reserved);
+        BUG_ON(current->journal_info);
+        current->journal_info = &tr;
+
+        __gfs2_ail_flush(gl);
+
+        gfs2_trans_end(sdp);
+        gfs2_log_flush(sdp, NULL);
+}
 
+void gfs2_ail_flush(struct gfs2_glock *gl)
+{
+        struct gfs2_sbd *sdp = gl->gl_sbd;
+        unsigned int revokes = atomic_read(&gl->gl_ail_count);
+        int ret;
+
+        if (!revokes)
+                return;
+
+        ret = gfs2_trans_begin(sdp, 0, revokes);
+        if (ret)
+                return;
+        __gfs2_ail_flush(gl);
         gfs2_trans_end(sdp);
         gfs2_log_flush(sdp, NULL);
 }
diff --git a/fs/gfs2/glops.h b/fs/gfs2/glops.h
index b3aa2e3210fd..6fce409b5a50 100644
--- a/fs/gfs2/glops.h
+++ b/fs/gfs2/glops.h
@@ -23,4 +23,6 @@ extern const struct gfs2_glock_operations gfs2_quota_glops;
 extern const struct gfs2_glock_operations gfs2_journal_glops;
 extern const struct gfs2_glock_operations *gfs2_glops_list[];
 
+extern void gfs2_ail_flush(struct gfs2_glock *gl);
+
 #endif /* __GLOPS_DOT_H__ */